virtio_test: support event index

Add ability to test the new event idx feature,
enable by default.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 17 insertions, 2 deletions

diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c
index df0c6d2c3860..74d3331bdaf9 100644
--- a/tools/virtio/virtio_test.c
+++ b/tools/virtio/virtio_test.c
@@ -198,6 +198,14 @@ const struct option longopts[] = {
                 .val = 'h',
         },
         {
+                .name = "event-idx",
+                .val = 'E',
+        },
+        {
+                .name = "no-event-idx",
+                .val = 'e',
+        },
+        {
                 .name = "indirect",
                 .val = 'I',
         },
@@ -211,13 +219,17 @@ const struct option longopts[] = {
 
 static void help()
 {
-        fprintf(stderr, "Usage: virtio_test [--help] [--no-indirect]\n");
+        fprintf(stderr, "Usage: virtio_test [--help]"
+                " [--no-indirect]"
+                " [--no-event-idx]"
+                "\n");
 }
 
 int main(int argc, char **argv)
 {
         struct vdev_info dev;
-        unsigned long long features = 1ULL << VIRTIO_RING_F_INDIRECT_DESC;
+        unsigned long long features = (1ULL << VIRTIO_RING_F_INDIRECT_DESC) |
+                (1ULL << VIRTIO_RING_F_EVENT_IDX);
         int o;
 
         for (;;) {
@@ -228,6 +240,9 @@ int main(int argc, char **argv)
                 case '?':
                         help();
                         exit(2);
+                case 'e':
+                        features &= ~(1ULL << VIRTIO_RING_F_EVENT_IDX);
+                        break;
                 case 'h':
                         help();
                         goto done;